Add simple entrypoint

Author: a3s7p

Dockerfile

@@ -18,8 +18,11 @@ RUN set -x \
 RUN set -x \
     && apt-get update \
     && apt-get -y install nginx \
-    && apt-clean --aggressive
+    && apt-clean --aggressive \
+    && sed -i "s/\(worker_processes\) .*;$/\1 1;/" /etc/nginx/nginx.conf 
+
+COPY entrypoint /entrypoint
 
-ENTRYPOINT ["/tini", "--"]
-CMD ["nginx", "-g", "daemon off;"]
+ENTRYPOINT ["/tini", "--", "/entrypoint"]
+CMD ["nginx"]
 EXPOSE 80 443

entrypoint

@@ -0,0 +1,16 @@
+#!/bin/bash -e
+
+if [ "${1:0:1}" = "-" ]; then
+       set -- nginx "$@"
+fi
+
+if [ "$1" = "nginx" ]; then
+   # forward access and error logs to docker log collector
+   [ -z "$NOSTDOUTREDIR" ] && ln -sf /dev/stdout /var/log/nginx/access.log
+   [ -z "$NOSTDERRREDIR" ] && ln -sf /dev/stderr /var/log/nginx/error.log
+
+   # run nginx in the foreground
+   exec "$@" -g "daemon off;"
+fi
+
+exec "$@"